Draw-plate punch



(No Model.)

M. R0ESGE N. I

DRAW PLATE PUNCH.

No. 314,543. Patented Mar. 24; 1885- U ITED ra'rns ATENT .rrrcn.

MATHIAS ROESGEN, OF PITTSBURG, ASSIGNOR OF ONE-HALF TO OTTO BERGMANN, OF ALLEGHENY CITY, PENNSYLVANIA.

DRAW-PLATE PUNCH.

SPECIFICATION forming part of Letters Patent No. 314,543, dated March 24,1885.

Application filed August 7, 1884.

To aZZ whom) it may concern Be it known that I, MATHIAS BOESGEN, of

'Pittsburg, in the county of Allegheny and wherever they occur.

In the operation of manufacturing wire it is usual to draw rods of the desired metal through draw-plates provided with a number of conical or tapering holes, and by passing the rods through a succession of such holes of constantlydiminishing diameter to reduce the wire to the required thickness. These draw plates must be made of very hard steel,

' and it has been customary to form each hole therein separately by repeatedly punching it with successively smaller punches to secure the desired taper. Reheating of the plates, which must be done at least once after punching of each hole, causes a weakening of the metal, which very materially diminishes the efficiency of the finished article. It is the purpose of my invention to overcome this disadvantage by providing means whereby the holes of the draw-plate may be punched at one operation and with but one heating. The advantages resulting from such apparatus are obvious.

Referring now to the drawings, a represents a drop or punch holder of the usual construction, arranged on the face of which are a series of conical projections or punches, b", preferably secured and adjusted there in a peculiar manner, which I will describe herein-- after. The steel plate 0, which is desired to be made into a draw-plate, is suitably adjusted within a cavity in the bed-plate cl of the punch, and is secured there by means of setscrews 6. A plate or frame, I), is secured to the face of the drop a by means of a dovetail on the back thereof, and is provided with a (No model.)

series of grooves, b", beveled so as to hold and retain a number of the conical punches b, the shanks of which are chamfered correspondingly. (See Fig. 3.) The punches bare made separate from each other, and are adjusted by successively sliding their chamfered bases into the grooves b from the ends thereof. They are secured therein by means of a rod or bar, h, bolted or otherwise fastened over the outer ends of the grooves. Set'screwsipass through the bar h, opposite to each of the grooves 12 and, engaging with the shanks of the end punches ofeach series, press the punches closely and firmly together.

Thus constructed, the operation of my improvement is as follows: The plate 0, having been heated, is adjusted within the bed-plate d, and the drop a is caused to descend and strike the punches or teeth 12 upon its surface. By these means tapering holes is are punched upon the plate and correspond in position with the situation of the small punches or teeth b. These punches should be made of such length that the holes 70 may not extend entirely through the plate a. The plate is then removed from the bed-plate d, and the draw-holes is completed by hand-punching entirely through the plate, in the usual manner. The punch-teeth b may be of any desired size and number. The advantage of setting them in slots in the frame b is, that if any one tooth or punch should become damaged it may easily be replaced by removing the bar h and the set-screws t. It is clear, also, that by use of suitable blocks or spaces, such as are used in type-setting, adjacent punch-teeth may be separated from each other as far as desired, and the situation of the holes in the draw-plate thereby varied.

If preferred, any other well-known method of reinovably setting the punch-teeth in the frame I) may be adopted.

Having thus described my improvement so that others skilled in the art may manufacture and use it, what I claim as my invention, and desire to secure by Letters Patcnhis 1. In apparatus for making draw-plates for wire-drawing machines, the combination of a matrixhaving a cavity for the reception of the plate, a punch.or die frame, and a series of conical punches or dies, the operating faces of which are shorter in length than the depth of IOO the cavity in the matrix, substantially as and securing device, substantially as and for the IO for the purpose specified. purpose specified.

2. In apparatus for making draw-plates for In testimony whereof I have hereunto set wire-drawing machines,the combination of the my hand this 4th day of August, A. D. 1884. punch frame or holder 6, havin longitudinal 5 dovetailed grooves formed th rein separate MATHIAS ROESGEN from each other, said grooves being of unequal Witnesses: length, a series of punches having a dovetailed THOMAS W. BAKEWELL, base adapted to fit within the grooves, and a OTTO BERGMANN. 

